From owner-freebsd-current@FreeBSD.ORG  Fri Jan 23 08:12:50 2009
Return-Path: <owner-freebsd-current@FreeBSD.ORG>
Delivered-To: freebsd-current@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id E2896106566C
	for <freebsd-current@freebsd.org>; Fri, 23 Jan 2009 08:12:50 +0000 (UTC)
	(envelope-from kientzle@freebsd.org)
Received: from kientzle.com (kientzle.com [66.166.149.50])
	by mx1.freebsd.org (Postfix) with ESMTP id AEB788FC16
	for <freebsd-current@freebsd.org>; Fri, 23 Jan 2009 08:12:50 +0000 (UTC)
	(envelope-from kientzle@freebsd.org)
Received: from [10.123.2.23] (h-66-166-149-52.snvacaid.covad.net
	[66.166.149.52])
	by kientzle.com (8.12.9/8.12.9) with ESMTP id n0N8ClC1090338;
	Fri, 23 Jan 2009 00:12:48 -0800 (PST)
	(envelope-from kientzle@freebsd.org)
Message-ID: <49797BFD.3060805@freebsd.org>
Date: Fri, 23 Jan 2009 00:12:45 -0800
From: Tim Kientzle <kientzle@freebsd.org>
User-Agent: Mozilla/5.0 (X11; U; FreeBSD i386; en-US; rv:1.7.12) Gecko/20060422
X-Accept-Language: en-us, en
MIME-Version: 1.0
To: Daichi GOTO <daichi@ongs.co.jp>
References: <49796E09.7000805@ongs.co.jp>
In-Reply-To: <49796E09.7000805@ongs.co.jp>
Content-Type: text/plain; charset=us-ascii; format=flowed
Content-Transfer-Encoding: 7bit
Cc: FreeBSD Current <freebsd-current@freebsd.org>
Subject: Re: sparse file issue?, dd(1) works well but tar(1) not on different
 partition
X-BeenThere: freebsd-current@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Discussions about the use of FreeBSD-current
	<freebsd-current.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>, 
	<mailto:freebsd-current-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-current>
List-Post: <mailto:freebsd-current@freebsd.org>
List-Help: <mailto:freebsd-current-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
	<mailto:freebsd-current-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Fri, 23 Jan 2009 08:12:51 -0000

Daichi GOTO wrote:
> Hi sparse guys (?)
> 
> I have been wondering about sparse file transportation between different
> partitions on -current. For example,
> 
>   /localapps/qemu/ on local disk (UFS2)
>   /nfshome/user/ on NFS (UFS2)
> 
>   /localapps/qemu/disk0image  20GB qemu diskimage sparsed file
> 
> then, follow operation works well.
> 
>   # cd /localapps/qemu/
>   # tar cpf - disk0image | tar xpf - -C /nfshome/user/
>   # cd /nfshome/user/
>   # dd if=disk0image of=disk0image-sparse conv=sparse
> 
> But
> 
>   # cd /localapps/qemu/
>   # tar cpf - disk0image | tar xpf - -S -C /nfshome/user/
> 
> gets follow error message.
> 
>   # tar cpf - disk0image | tar xpf - -S -C /nfshome/user/
>   disk0image: Write request too large
>   tar: Error exit delayed from previous errors.
>   #
> 
> tar(1) cannot do sparse output between different partations?
> Have I missed something important point?  If you have any ideas,
> teach me.

Looks like I managed to break -S recently.  I'll
send you a patch soon.

Tim